CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

**Executive summary:** CISA and Microsoft confirmed active exploitation of multiple critical Microsoft SharePoint Server vulnerabilities affecting supported on-premises versions; attackers have used a combination of RCE, elevation-of-privilege and spoofing flaws to gain access, steal IIS machine keys, deploy malware and maintain persistence. Microsoft released patches for five CVEs and AMSI/Microsoft Defender signatures are available; Tenable and CISA advise urgent patching, AMSI integration, restricting internet exposure and reviewing telemetry for IOCs.